Question

why is it that element in a group have similar properties

Answer 1

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~* THE ANSWER OF YOUR QUESTION IS..*~

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ELEMENTS IN GROUP HAVE SIMILAR CHEMICAL PROPERTIES BECAUSE THEY HAVE SAME VALANCE ELECTRONS...

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Answer 2

Hi friend the answer is
The number of electrons in outermost shell is the same.
So the elements have to gain or lose the same number of electrons. this makes their properties similar.
Example: Elements in the alkali metal group have one extra electron in their outermost shell.